Crystal oscillator frequency calibration method and calibration device for communication terminal

Abstract

A crystal oscillator frequency calibration method and calibration device for a communication terminal, the crystal oscillator frequency calibration method for the communication terminal includes: measuring and obtaining the reference frequency adjustment step corresponding to the center frequency of the reference crystal oscillator of the communication terminal; based on the adjustment coefficient and The reference frequency adjustment step is to determine the frequency adjustment step corresponding to the channel center frequency point of the frequency band where the communication terminal normally works, and the adjustment coefficient is the center frequency point of the channel center frequency point and the center frequency of the reference crystal oscillator ratio between. The technical solution of the present invention can not only increase the flexibility and efficiency of frequency calibration, that is, support the crystal oscillator frequency calibration of communication terminals in any communication mode and any frequency point, but also improve the frequency calibration accuracy, and is suitable for any frequency band or even a certain ultra-wide frequency band .

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a crystal oscillator frequency calibration method and a calibration device for a communication terminal. Background technique [0002] The Long Term Evolution (LTE, Long Term Evolution) technology is the evolution of the third generation mobile communication technology (3G), which started at the 3GPP Toronto conference in 2004. LTE is not the fourth-generation mobile communication technology (4G) that is commonly misunderstood by people, but a transition between 3G and 4G technology. It is the global standard of 3.9G. Frequency division multiplexing technology (OFDM, Orthogonal Frequency Division Multiplexing) and multiple-input multiple-output technology (MIMO, Multiple-Input Multiple-Output) are the only standards for the evolution of its wireless network, which can provide downlink 326Mbit / s and The uplink peak rate of 86Mbit / s improves the performance of cell edge use...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of the existing technology is that the existing communication terminals are only divided into two frequency adjustment steps of high frequency and low frequency, but for communication terminals supporting various communication modes (communication standards) and multiple frequency bands (ie This method is still used on communication terminals that support multi-mode and multi-frequency), which is obviously not very accurate, so it is difficult to adapt to the crystal frequency calibration of communication terminals that support multi-mode and multi-frequency

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